CN208386122U - A kind of automotive electronics high current current foldback circuit - Google Patents
A kind of automotive electronics high current current foldback circuit Download PDFInfo
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- CN208386122U CN208386122U CN201821016089.0U CN201821016089U CN208386122U CN 208386122 U CN208386122 U CN 208386122U CN 201821016089 U CN201821016089 U CN 201821016089U CN 208386122 U CN208386122 U CN 208386122U
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- 239000004065 semiconductor Substances 0.000 claims abstract description 38
- 230000003321 amplification Effects 0.000 claims abstract description 20
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model relates to a kind of automotive electronics high current current foldback circuits; including metal-oxide-semiconductor driving circuit; the input terminal of the metal-oxide-semiconductor driving circuit is connected with the output of drive control module; output end is connected with load blocks; it further include operational amplification circuit and protection circuit; the input terminal of the operational amplification circuit is connected with the output end of metal-oxide-semiconductor driving circuit, and output end is connected with the input terminal of the protection circuit, and the output end of the protection circuit is connected with the input terminal of metal-oxide-semiconductor driving circuit.The overcurrent protection ability that the utility model improves power circuit reduces controller system cost simultaneously.
Description
Technical field
The utility model relates to a kind of current foldback circuits, more particularly to a kind of automotive electronics high current overcurrent protection electricity
Road.
Background technique
Conventional current foldback circuit mainly for low current overcurrent protection, and the overcurrent protection of high current design mainly make
With integrated device, higher cost, while integrated device current version is few, alternative low.Part high current overcurrent protection design
It recycles software algorithm to realize the protection to load by carrying out current sample to sampling resistor using sampling resistor scheme, is somebody's turn to do
Scheme has the shortcomings that the response time is slow, or even cannot achieve the timely protection to controller.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of automotive electronics high current current foldback circuits, improve
The overcurrent protection ability of power circuit reduces controller system cost simultaneously.
The technical scheme adopted by the utility model to solve the technical problem is as follows: providing a kind of automotive electronics high current overcurrent
Circuit, including metal-oxide-semiconductor driving circuit, the input terminal of the metal-oxide-semiconductor driving circuit is protected to be connected with the output of drive control module,
Output end is connected with load blocks, further include operational amplification circuit and protection circuit, the input terminal of the operational amplification circuit with
The output end of metal-oxide-semiconductor driving circuit is connected, and output end is connected with the input terminal of the protection circuit, the output of the protection circuit
End is connected with the input terminal of metal-oxide-semiconductor driving circuit.
When normal work, the metal-oxide-semiconductor driving circuit is worked normally, and the operational amplification circuit and protects circuit not work
Make；When there is throat floater, the operational amplification circuit and protection circuit work simultaneously switch off the metal-oxide-semiconductor driving circuit.
The metal-oxide-semiconductor driving circuit includes metal-oxide-semiconductor, second resistance and the 5th resistance, and the grid of the metal-oxide-semiconductor passes through second
Resistance is connected with the output of drive control module, grounded drain, source electrode are connected with load blocks；One end of 5th resistance with
The output of drive control module is connected, and the other end is connected with the drain electrode of the metal-oxide-semiconductor.
The operational amplification circuit includes operational amplifier, first resistor, the 6th resistance, the 8th resistance and capacitor；It is described
The normal phase input end of operational amplifier is connected by first resistor with the source electrode of the metal-oxide-semiconductor, inverting input terminal passes through the 6th electricity
Resistance is connected with the drain electrode of the metal-oxide-semiconductor, and output end is connected with the input terminal of the protection circuit；The positive of the operational amplifier
Capacitor is also connected between input terminal and inverting input terminal；One end of 8th resistance and the output end of the operational amplifier
It is connected, the other end is connected with the inverting input terminal of the operational amplifier.
The protection circuit includes transistor, 3rd resistor, the 4th resistance and the 7th resistance；One end of 4th resistance
Be connected with the output end of operational amplification circuit, the other end is connected with the base stage of the transistor, one end of the 7th resistance with
The other end of 4th resistance is connected, other end ground connection；The emitter ground connection of the transistor, collector pass through 3rd resistor and institute
The input terminal for stating metal-oxide-semiconductor driving circuit is connected.
Beneficial effect
Due to the adoption of the above technical solution, the utility model compared with prior art, has the following advantages that and accumulates
Pole effect: the utility model realizes the high current overcurrent protection function of power circuit using discrete device, reduces controller cost,
Safeguard measure is hardware protection simultaneously, intervenes without software, has the advantages that the response time is fast.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please the appended claims limited range.
The embodiments of the present invention is related to a kind of automotive electronics high current current foldback circuit, as shown in Figure 1, including
The input terminal of metal-oxide-semiconductor driving circuit, the metal-oxide-semiconductor driving circuit is connected with the output of drive control module, output end and load
Module is connected, and further includes operational amplification circuit and protection circuit, the input terminal and metal-oxide-semiconductor driving circuit of the operational amplification circuit
Output end be connected, output end with it is described protection circuit input terminal be connected, it is described protection circuit output end and metal-oxide-semiconductor driving
The input terminal of circuit is connected.When normal work, the metal-oxide-semiconductor driving circuit is worked normally, the operational amplification circuit and protection
Circuit does not work；When there is throat floater, the operational amplification circuit and protection circuit work simultaneously switch off the metal-oxide-semiconductor
Driving circuit.
Wherein, metal-oxide-semiconductor driving circuit includes N-MOS pipe Q1, second resistance R2 and the 5th resistance R5, the N-MOS pipe Q1
Grid by the way that second resistance R2 is connected with the output of drive control module, grounded drain, source electrode are connected with load blocks；It is described
One end of 5th resistance R5 is connected with the output of drive control module, and the other end is connected with the drain electrode of the N-MOS pipe Q1.
Operational amplification circuit includes operational amplifier U1, first resistor R1, the 6th resistance R6, the 8th resistance R8 and capacitor
C1；The normal phase input end of the operational amplifier U1 is connected by first resistor R1 with the source electrode of the N-MOS pipe Q1, reverse phase is defeated
Enter end to be connected by the 6th resistance R6 with the drain electrode of the N-MOS pipe Q1, output end is connected with the input terminal of the protection circuit；
Capacitor C1 is also connected between the normal phase input end and inverting input terminal of the operational amplifier U1；The one of the 8th resistance R8
End is connected with the output end of the operational amplifier U1, and the other end is connected with the inverting input terminal of the operational amplifier U1.
The protection circuit includes NPN transistor Q2,3rd resistor R3, the 4th resistance R4 and the 7th resistance R7；Described
One end of four resistance R4 is connected with the output end of operational amplification circuit, and the other end is connected with the base stage of the NPN transistor Q2, institute
The one end for stating the 7th resistance R7 is connected with the other end of the 4th resistance R4, other end ground connection；The emitter of the NPN transistor Q2
Ground connection, collector are connected by 3rd resistor R3 with the input terminal of the metal-oxide-semiconductor driving circuit.
Load blocks in present embodiment can be the high power devices such as loading motor or heater strip, when the normal work of system
When making, N-MOS pipe Q1 is connected in drive control module output high level, and the drain electrode of the N-MOS pipe Q1 after conducting is low level, N-
Metal-oxide-semiconductor drain electrode enters operation amplifier by input resistance R1 and R6 without pressure difference, drain electrode and the differential voltage of source electrode substantially with source electrode
Device amplifies drain-source differential voltage, and amplified voltage passes through the bleeder circuit input being made of the 4th resistance and the 7th resistance
NPN transistor Q2 is given, due to draining with source electrode substantially without pressure difference, amplified driving voltage is low level (being less than 0.3V)
Transistor Q2 can not be made to be connected, the collector of transistor Q2 is still high level, and system worked well is without exception.
When system during the work time, when load blocks port failure is shorted to power supply, N-MOS pipe Q1 is due to Rds
The presence of resistance causes the voltage between the drain electrode and source electrode of N-MOS pipe Q1 to be lifted rapidly, and the drain-source voltage after lifting is by fortune
After calculating amplifier amplification, it is input to the base stage of transistor Q2, transistor Q2 is rapidly opened, and the collector of transistor Q2 is pulled low
To low level, N-MOS pipe is driven to be cut off, to realize high current overcurrent protection function.
In present embodiment, the amplification factor of operational amplification circuit can be by adjusting first resistor R1, the 6th resistance R6
And the 8th the resistance value of resistance R8 be configured.The adjustment of transistor Q2 operating voltage critical value can be by adjusting the 4th resistance
The intrinsic standoff ratio of R4 and the 7th resistance R7 are realized.
The current foldback circuit major parameter of present embodiment is shown in Table 1:
| Characterisitic parameter | Range |
| MCU driving voltage | 2V~30V |
| Overcurrent protection ability | 0A~100A |
| Metal-oxide-semiconductor drain-source differential voltage amplification factor | 0~100 times |
| The overcurrent protection response time | ≤1us |
| Operating temperature | - 40 DEG C~125 DEG C |
Table 1
It is not difficult to find that the utility model realizes the high current overcurrent protection function of power circuit using discrete device, reduce
Controller cost, while safeguard measure is hardware protection, intervenes without software, has the advantages that the response time is fast.
Claims (4)
1. a kind of automotive electronics high current current foldback circuit, including metal-oxide-semiconductor driving circuit, the metal-oxide-semiconductor driving circuit it is defeated
Enter end to be connected with the output of drive control module, output end is connected with load blocks, which is characterized in that further include operation amplifier electricity
Road and protection circuit, the input terminal of the operational amplification circuit is connected with the output end of metal-oxide-semiconductor driving circuit, output end with it is described
The input terminal of circuit is protected to be connected, the output end of the protection circuit is connected with the input terminal of metal-oxide-semiconductor driving circuit.
2. automotive electronics high current current foldback circuit according to claim 1, which is characterized in that the metal-oxide-semiconductor driving
Circuit includes metal-oxide-semiconductor, second resistance and the 5th resistance, and the grid of the metal-oxide-semiconductor passes through second resistance and drive control module
Output is connected, grounded drain, source electrode are connected with load blocks；One end of 5th resistance and the output phase of drive control module
Even, the other end is connected with the drain electrode of the metal-oxide-semiconductor.
3. automotive electronics high current current foldback circuit according to claim 2, which is characterized in that the operation amplifier electricity
Road includes operational amplifier, first resistor, the 6th resistance, the 8th resistance and capacitor；The normal phase input end of the operational amplifier
It is connected by first resistor with the source electrode of the metal-oxide-semiconductor, the drain electrode phase that inverting input terminal passes through the 6th resistance and the metal-oxide-semiconductor
Even, output end is connected with the input terminal of the protection circuit；The normal phase input end and inverting input terminal of the operational amplifier it
Between be also connected with capacitor；One end of 8th resistance is connected with the output end of the operational amplifier, the other end and the fortune
The inverting input terminal for calculating amplifier is connected.
4. automotive electronics high current current foldback circuit according to claim 1, which is characterized in that the protection circuit packet
Include transistor, 3rd resistor, the 4th resistance and the 7th resistance；One end of 4th resistance and the output end of operational amplification circuit
It is connected, the other end is connected with the base stage of the transistor, and one end of the 7th resistance is connected with the other end of the 4th resistance, separately
One end ground connection；The emitter ground connection of the transistor, collector pass through the input terminal of 3rd resistor and the metal-oxide-semiconductor driving circuit
It is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821016089.0U CN208386122U (en) | 2018-06-29 | 2018-06-29 | A kind of automotive electronics high current current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821016089.0U CN208386122U (en) | 2018-06-29 | 2018-06-29 | A kind of automotive electronics high current current foldback circuit |
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| Publication Number | Publication Date |
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| CN208386122U true CN208386122U (en) | 2019-01-15 |
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| CN201821016089.0U Active CN208386122U (en) | 2018-06-29 | 2018-06-29 | A kind of automotive electronics high current current foldback circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683152A (en) * | 2018-06-29 | 2018-10-19 | 上海拓为汽车技术有限公司 | A kind of automotive electronics high current current foldback circuit |
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2018
- 2018-06-29 CN CN201821016089.0U patent/CN208386122U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683152A (en) * | 2018-06-29 | 2018-10-19 | 上海拓为汽车技术有限公司 | A kind of automotive electronics high current current foldback circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240322 Address after: No. 268, Yuwangshan Road, Daqi Street, Beilun District, Ningbo, Zhejiang 315825 Patentee after: NINGBO TUOPU GROUP Co.,Ltd. Country or region after: China Address before: 201203 Shanghai Pudong New Area China (Shanghai) Free Trade Pilot Area, No. 88 Darwin Road, 3 buildings, 5 floors Patentee before: SHANGHAI TUOWEI AUTOMOTIVE TECHNOLOGY CO.,LTD. Country or region before: China |